Conventional Radiography: Introduction, Types, Process, Advantages & Disadvantages

 

A manual technique of Radiography, Where Gamma rays or X-rays are bombarded on the specified area for a certain period of time, Producing an image to detect any internal cavity on the specimen”, Known as Conventional radiography.

Introduction-  

Conventional Radiography is the most widely and well known NDT method over Digital Radiography.

This basically uses High Energy photons to Detect Various flaws in the test specimen, which you will be know further in detail down below.

Now, Let’s dwell step by step information about conventional radiography, Here you will get complete information on Conventional Radiography.

Lets, First get some knowledge of what is Radiography?

What is Radiography?

It is a technique for detecting any internal cavity of any metals or alloy using ionizing radiation like  Gamma rays or X-rays without any wear and tear. Where we use Gamma or X-rays camera and films to performs any Radiography testing.

conventional radiography

I hope, you gained a main overview of Radiography, So now let’s know about the types of Radiography.

Type of Radiography- 

There are mainly two types of Radiography

1. Conventional Radiography(CR)

2. Digital Radiography(DR)

Here, I Will discuss Conventional radiography, keeping in mind your purpose of landing on this page.

Conventional Radiography-

As I discussed above, Gamma rays or X-rays is used to detect the discontinuity in the object on Surface level or Sub-Surface level through the manual process.

It is all done manually, from taking a shot, developing and processing films, and also interpretation of films, where the internal cavity is discussed.
 
Now, let’s discuss the Actual Procedure of Conventional Radiography.

Conventional Radiography Process

In this type of radiography, you need a gamma or x-rays camera, a film cassette, a specific object, and some numbers to identify areas for marking after completing the procedure of Radiography testing.

 
radiography
 
First, the Specified object is marked for radiography testing according to client requirement and places numbers in specific areas to identify later on.
 
Now, Radiography film is placed underneath of specified location or according to the demand of that time.
 
Then, Source is placed, maintaining the distance between source and object, called SFD(Source to Film Distance), According to specified Area or Film length.
 
Gamma or X-rays are bombarded on the object for a certain period of time according to the thickness of the object and the distance between the Object and Film.
 
Then, radiography Cassete goes for the Developing, Where Radiography film goes through a certain procedure, Called processing of Radiograph.
 
Now, Radiograph hangs for some time at a certain temperature, to let it dry.
 
Now, the Procedure is almost complete except for interpretation. After Interpretation, Conventional Radiography is completed. This is the whole procedure of Conventional Radiography.
 
Now, You know the detailed procedure of conventional Radiography, There are also the Advantages and disadvantages of conventional Radiography, You should know. I think !!

Advantages of Conventional Radiography-

Here are some advantages of CR-
  • Suitable for complex structure materials
  • Minimum space area required
  • Higher thickness materials inspection
  • The minimum size of flaws can be detected
  • Variety of materials inspection

Disadvantages of Conventional Radiography

1. Resolution difficulty- Because of manual processing, Maximum changes are the resolution of the radiograph is not adequate or the density of the radiograph is low, resulting to re-shoot or re-take again.

2. In-complete information- Due to the limitation of radiography, we can not get complete information, Because you can take a single shot per taking, resulting in taking multiple shots of a single object to cover the whole area, Due to that, some parts of the object area may left. 

3. Processing error- Processor error is one of the biggest limitations in conventional radiography. Because, When a film is processed manually, there are maximum chances of getting scratch on film, or film contrast might be high or low, resulting in Re-take. A single mistake, Your all works have vanished.

4. Radiation exposure- While taking Radiography shots, the Object is bombarded by Gamma or X-rays and if a Radiography person is there, he hits by those radiations with the same intensity. The more he is getting involved in multiple shots, He continuously exposed to radiation, and these continue hits of radiation attacks on their cell, causing Radiation health hazardous for him in long run. 

5. Extreme physical activities- A radiography person has to run continuously, To minimize radiation exposure during the shots.

6. Wastage of resources- While performing the test, There are several mistakes that might be done like processing errors, and this cause various resource wastage including manpower loss, Film loss, Time-lose, etc.

For more detailed information, You can watch out this video Given Below-

 

If You are here for Conventional Radiography, then that’s it from the side, or if you want to know more about Digital Radiography comparison with Conventional Radiography. 

Then continue with me…..

➤Digital Radiography Vs Conventional Radiography

Here I will compare  Digital radiography and Conventional Radiography side by side.

Conventional Radiography-

  • Fixed Contrast- The contrast of the radiograph is fixed in this type of radiography, You can not change film density If needed.
  • Limited View- It gives only a 2D view of a 3D object, you can not zoom in or zoom out or Flip the image If needed.
  • Duplicacy– Conventional Radiography is the best technique to create a duplicate image. If you want to show the clean image without any cavity to the client, You just need to take a shot from the Passed area bolllaa, You are good to go.
  • Mobile-friendly– Set up of convention type of Radiography can be mobilized, if an object can not move.

Digital Radiography-

  • Variable Contrast- The contrast of the radiograph can vary, You can adjust the contrast of the radiograph according to your need.
  • Unlimited View-  It gives a very detailed and crisp image of the object and you can also zoom in and zoom or flip according to your needs.
  • Time-Saver- Digital radiography saves an enormous amount of time Because it combines all needed equipment in a single place and can operate at ease with approx single manpower.

These are the basic side-by-side comparison of both types of Radiography, Both are suitable at their place Because of mobility in some cases.

All About Digital Radiography in the next 10min!

For Detailed comparison knowledge regarding the same, You can give a watch to this video clip given Below…

 

Conclusion- 

Conventional radiography is the trusted NDT method, used as most. The flexibility in equipment mobilization is the best part of CR.
 
rest all you have read above, so I am not going to repeat the same again here.
 
I hope, you got the knowledge, of whom you are here.
 
If so, then hit the share button and toss this knowledge to the needed one. you will help one more to be knowledgeable.

FAQs-

Q. What is the difference between conventional radiography and digital radiography?
Ans. The basic difference between Conventional and digital radiography is that conventional radiography runs on manual processes of radiography whereas digital radiography uses the digital form of radiography.
Q.When is conventional radiography used?
Ans. The uses of conventional radiography are broad. It is used in various sectors including industrial sectors and the medical industry as well.
Q.What are the types of radiography?
Ans. There are two types of Radiography-
  1. Conventional radiography
  2. Digital radiography
Q. What is the limitation of conventional radiography?

Ans. Here are some limitations of CR-

  • Lack of resolution
  • Physical activities
  • Resources wastage
 
 
Resources- Wikipedia

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